const std = @import("std");
const driver_manager = @import("driver_manager.zig");
const api = @import("api.zig");

// 示例驱动数据结构
const ExampleDriverData = struct {
    // 驱动私有数据
    allocator: std.mem.Allocator,
    device_count: u32,
};

// 示例驱动命令
pub const EXAMPLE_IOCTL_GET_INFO = 0x01;
pub const EXAMPLE_IOCTL_SET_VALUE = 0x02;
pub const EXAMPLE_IOCTL_GET_VALUE = 0x03;

// 示例设备信息
const ExampleDeviceInfo = struct {
    name: [32]u8,
    version: u32,
    value: u64,
};

// 初始化驱动
fn init_driver(allocator: std.mem.Allocator, driver_data: *anyopaque) bool {
    std.log.info("Example driver initialized");
    
    // 分配驱动数据
    const example_data = allocator.create(ExampleDriverData) catch {
        std.log.err("Failed to allocate driver data");
        return false;
    };
    
    example_data.* = ExampleDriverData{
        .allocator = allocator,
        .device_count = 0,
    };
    
    // 存储驱动数据
    @atomicStore(*anyopaque, driver_data, example_data, .Release);
    return true;
}

// 清理驱动
fn deinit_driver(driver_data: *anyopaque) void {
    const example_data = @ptrCast(*ExampleDriverData, @alignCast(@alignOf(ExampleDriverData), driver_data));
    std.log.info("Example driver deinitialized");
    example_data.allocator.destroy(example_data);
}

// 探测设备
fn probe_device(device_info: *driver_manager.DeviceInfo) bool {
    // 我们的示例驱动可以处理任何未知类型的设备
    // 在实际驱动中，这里会检查设备ID、类ID等
    std.log.info("Example driver probing device: VID={x}, PID={x}", .{device_info.vendor_id, device_info.device_id});
    
    // 只处理特定类型的设备
    if (device_info.class_id == 0x000000 and device_info.bus_type == .unknown) {
        std.log.info("Device matched");
        return true;
    }
    
    return false;
}

// 移除设备
fn remove_device(device_id: u64) void {
    std.log.info("Example driver removing device: {d}", .{device_id});
}

// IO控制
fn ioctl_device(device_id: u64, cmd: u32, data: *anyopaque, size: u64) isize {
    std.log.info("Example driver IOCTL: device={d}, cmd={x}, size={d}", .{device_id, cmd, size});
    
    switch (cmd) {
        EXAMPLE_IOCTL_GET_INFO => {
            if (size < @sizeOf(ExampleDeviceInfo)) {
                return -1; // 缓冲区太小
            }
            
            const info = @ptrCast(*ExampleDeviceInfo, @alignCast(@alignOf(ExampleDeviceInfo), data));
            std.mem.copy(u8, &info.name, "Example Device");
            info.version = 1;
            info.value = 42;
            return @sizeOf(ExampleDeviceInfo);
        },
        
        EXAMPLE_IOCTL_SET_VALUE => {
            if (size < @sizeOf(u64)) {
                return -1; // 缓冲区太小
            }
            
            const value = @ptrCast(*u64, @alignCast(@alignOf(u64), data));
            std.log.info("Setting device value to: {d}", .{value.*});
            return 0;
        },
        
        EXAMPLE_IOCTL_GET_VALUE => {
            if (size < @sizeOf(u64)) {
                return -1; // 缓冲区太小
            }
            
            const value = @ptrCast(*u64, @alignCast(@alignOf(u64), data));
            value.* = 42;
            return @sizeOf(u64);
        },
        
        else => {
            std.log.info("Unknown IOCTL command");
            return -1; // 未知命令
        },
    }
}

// 示例驱动接口
pub const example_driver_interface = driver_manager.DriverInterface{
    .name = "example_driver",
    .description = "Example driver for testing",
    .version = 1,
    .init = init_driver,
    .deinit = deinit_driver,
    .probe = probe_device,
    .remove = remove_device,
    .ioctl = ioctl_device,
};

// 导出驱动接口
export fn example_driver_get_interface() *driver_manager.DriverInterface {
    return &example_driver_interface;
}